head to head · open source
OpenViking vs Nucleoid
OpenViking has 41,383 GitHub stars, 3,362 forks, 999 open issues and last shipped yesterday. Nucleoid has 772 stars, 33 forks, 12 open issues and last shipped yesterday. OpenViking leads on adoption by 5,260% (41,383 vs 772 stars). OpenViking is written in Python under AGPL-3.0; Nucleoid is written in Rust under Apache-2.0. OpenViking has attracted 8% as many forks as stars, Nucleoid 4%. Nucleoid was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (knowledge-base), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| OpenViking | Nucleoid | |
|---|---|---|
| GitHub stars | ★ 41K | ★ 772 |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Python | Rust |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 3.4K | ⑂ 33 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenViking if
- You weight community size — 41K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Nucleoid if
- You want the Nucleoid feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Rust
- You evaluated both and Nucleoid fits your workflow better
About OpenViking
The Context Database for AI Agents English / 中文 / 日本語 Website · Live Demo · GitHub · Issues · Docs · Blog Lark · WeChat · Discord · X What is OpenViking OpenViking is an open source context database for AI agents — one filesystem for everything an agent knows: knowledge, memory, and skills. Most agent memory is a black box: text goes in, embeddings come out, and nobody can see what was actually stored. OpenViking organizes context as a virtual filesystem under viking:// instead. Agents navigate it like files — ls , tree , read , write , grep — and you can open any directory to inspect and edit what your agent…
read the full OpenViking overview →
About Nucleoid
Nucleoid Logic Language for World Models 🌱🐋🌍 💭 Hallucinations are a major challenge in LLM reasoning because natural language is unstructured. By nature, LLMs are pattern engines that reason more effectively over structured entities and relationships, enabling more reliable, near deterministic results. ⚡ Nucleoid is designed with a minimally tokenized syntax for logic representation and a declarative execution model, eliminating the need for LLMs to manually manage control flow, state propagation, and other imperative constructs. In addition, Nucleoid is a next generation logic programming language built on…
read the full Nucleoid overview →
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Frequently asked questions
Is OpenViking or Nucleoid more popular?
OpenViking has 41,383 GitHub stars and Nucleoid has 772. OpenViking has the larger community by that measure.
Are OpenViking and Nucleoid free?
Both are open source. OpenViking is licensed under AGPL-3.0 and Nucleoid under Apache-2.0. Neither carries a licence fee.
What is the difference between OpenViking and Nucleoid?
OpenViking is written in Python and Nucleoid in Rust. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, OpenViking or Nucleoid?
Choose OpenViking if you want the larger community (41,383 stars) or its AGPL-3.0 licence terms. Choose Nucleoid if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.